2007-01-30 11:53:27 · 7 answers · asked by What you did....Why?....Why?.... 2 in Science & Mathematics ➔ Mathematics
17 = 7x2
21 = 3x7
2x3x7=42
2007-01-30 11:57:46 · answer #1 · answered by 7 · 0⤊ 0⤋
LCM is 42 bcuz 3 x 14 =42 and 2 x 21 = 42
2007-01-30 11:58:04 · answer #2 · answered by bandgirl818 1 · 0⤊ 0⤋
42
2007-01-30 11:57:06 · answer #3 · answered by confused1256 2 · 0⤊ 0⤋
42
2007-01-30 11:56:36 · answer #4 · answered by Anonymous · 0⤊ 0⤋
find the prime factorization of them. a factor tree really helps... then you just underline the most of the numbers that pops out. multiply them together and viola!! 2 times 7 and 3 times 7. that's 2 times 3 times 7 equals 21 times 2. that's 42.
2007-01-30 12:36:41 · answer #5 · answered by *cough cough* 2 · 0⤊ 0⤋
First notice that 7 is a common factor, so you're dealing with 2x7 and 3x7. Your lcd will be 2x3x7 = 42
2007-01-30 12:06:13 · answer #6 · answered by obelix 6 · 0⤊ 0⤋
LCM is 7
14=2x7
21=3x7
2007-01-30 12:31:59 · answer #7 · answered by Dave aka Spider Monkey 7 · 0⤊ 0⤋